Keyboard for calculators.



NT QFFICE www, T...

that are identical except in length, to move in a rectilineai path, each ot the stop baie is provided with a slot 30 in its forward enel', into which projects one of the lugs 'i7 that extend laterally fiom'lthe supporting 1.3. It will be seen that the rear ends et the stop bars are normally in vertical aliiiemeet but since the forward ends of the step bete are pivotetl f to the intliviflual bent Yeveiee their lengths.v will decrease epwemily shown, each stop bai being shorter in length than the lowerone by the distance epait the adjacent key stems, and the slcts 3G', aise similarly arranged to'engage thesucceesive lugs'lf.l The connection' between` the foi'-A ,wardf end of the stop bai' and the bent levee 23 is arranged to give a certain amount et so vers 23. The plate 29 is Similai'ly slottetl te Aaccommodate the four step baie en onesifle yof theplate 13 that aieiii vel-tical alinement,

movement because the bent levee will swing through the petit et an aise while the stop v and also the ive stop bars on the opposite y'side' of the plate 13, that also aliiie:v

y, The stop bars 27 on their tear ends usually as' indicated will. engage the toot l2 when cooperate with the rack amel type plate, and

the member 8 iselevated' to arrest its mover ment, the stop bai '32 being' shown aelv'enced rearward-4, and the others iii'theii' hoi'- mal forward pofltieii, that will not iiitei'feie with the/passage oi the' foot l2.

1 The stop bars 'are provided with any eeitable means toi cpereting with the lateli bars vi9'. As shown a lugg 33 is pifevicletl en each of the stop bars, having its ei'vvacl edge vertical, and its reei'eflge ineliiiecl.' 'The pins 22 on the latch'bar as, shown normally rest on o1' near the edge et' the stop bai' te f the rear of the lug 33, amiv suitable meme is provided for moving the step are ferwaeel after they have been advancedte aeimal position. Acoil spring 34; on each of the stop bays-'engages a lug theieon by omeeiifl and ttheplate 29 by itsother enel, to vmove the stop 'bar forward When ifeleasefl7 it will be seen'thatfthlis spring will the step bar along the lugv 17 at its 'forward elette@ enflymtil the end of this sletteel peton gages the lug and thus arfeststhe twat@ movement, and holds the step bei neted key stem iii Zammel peeitiefa, :inyflgey epresee, it will teelt :move the eenaeetetl -i'aisiiu'g the li and this iaieiiig et the latch bei" will tien. will time be eeen that have pro the bent levers, ami also by its iategtal luge v Whereupen the latch hay vwill tall. behind the lug 33 assisted lily-a spying 36, amlthe pin will mow 'engage the veitical edge et the lug 335 as indicated by the stop bai in Fig. l, The epi-ieg ie, lieiv'evei', tensione@ by this mmw'eiiiezat9 but the stt'aight sible et the lug 33 will Ihe pressezi against the ami "33e-event of the etep baifaiil lief/7 so iat thee bei will be loelteel in. the set iositieef, will i'eet l2., when the :tecla eetl i oe 1plate ie eleve/teli, Upea bei 19 by means, thev fein 22 'will be :tree from the lug, and the spying will drive the etep bai eiwaicl to its 'fermer Rostieii and elevate the key stem. lt will be tiith'et ebeeived that it" the key stem 24 ie mov-eti clown, its eetl will strikel the bettem et the iecesses l57 that acts as a ci-top te limit the depiession et the key, anti also the rearward movement of the etepibei connected, therewith. The set ltey anti stop hat (lo het Yehew the? key eiigagine, the betteln ot Tecesees 15, because the epiingiies ietiiriiecl the stop bai1 a ehoz't distance until the lug engages the pia l lttvili be also imtleietoocl that when one et the keys of the eet is (legi-essediq if other key is; pushed flown, the lateh bar 19 will be iaieecl by the engagement et the lug eeifve to 'felease any othei: stop bai that may have been locliefil ie the advanced posh e vialecl a simple and 'solapa/ct arrangement Wl'i'ereby the step plate i3 serves: te eiijppert ms a guide to? the stop bats at their waid enfle, aiicl'wliich lugeelse Serve to .limit the return movement step bare.. These lugs and the eiottefl step bats ee opeeatiiig thetw-lith7 'seive 'te piotlitee at ieetiliiieai i'eeipioeation the stop barst in! connection with Suitable geidee foi? the tear eetl' et the`r stop baie. lt will alse'be seen thet'the plate 13 'foiiiis a limit et stop et the bottom et the recesses `3159 teeth-e ley teme when clepi'eesed.,

Hevia@ thus described my inventiomwhat the other. of said members being provided with longitudinalslots into which said lugs project to guide the stop bars by 'the plates.

3. In a calculator, the combination of a supporting plate, a set of key stems, a set of stop bars, means connecting the key stems with the stop bars, and guiding means at the end of the stop bar adjacent the key connection to cause rectilinear reciprcation of thestop bar. y

4. In a calculator, the combination of a supporting plate, a set of key stems, a set of stop bars, means connecting the key stems with the stop bars respectively to advance the stop bars, the supporting plate and the stop bars being provided with laterally projecting lugs inv one of such members and the other of said members being provided with longitudinal slots into which said lugs pr0- ject to guide the stop bars by the plates, each said lug engaging the end of its slot in bthe bar to limit the movement of the bar in. one direction. l

5. In a calculator, the combination of a supporting plate provided with a set of laterally projecting lugs, arset of stopl bars each having a longitudinal slot and engaging the lugs respectively at the slotted portions, a set of key stems, means connecting the key stems with the stoprbars respectively i to advance the stop bars, and means for returning the stop bars andkey stems when advanced, each said lug engaging the end of its slot in the. bar to limit the return Inovement of such bar.

6. In a calculator, a supporting plate con-- taining a series of recesses, a' set of bell cranks pivoted to said plate between the re- Y cesses respectively, a set of key stems one pivoted to each of said bell cranks and operating in said recesses respectively, a set of stop bars eachpivoted to one of said bell cranks, cach stop bar having a longitudinal slot near the pivot end, each of the plate extensions between. the recesses having a lateral bent lug projecting into one of said stop bar slots to guidcthe stop bar for rectilinear movement at such portion, and means't'or returning each stop bar and key stennto normal position with the lug engaging the end of the bar slot to limit such movement, said lugs and bar slots being arranged to permit the key stems when depressed to be arrested by the bottoms of said recesses in the plate.

' JASON C. LOTTERHAND. -W'itnesses j WM. H..REID, CAROL M. Row'AN. 

